Filter element



Nov. 5, 1929. o. v; GREENE 1,734,125 I FILTER ELEMENT Filed March 27, 1925 4 Sheets-Sheet 1 INVENTOR. Qscar' 1 Greae N0v. 5, 1929. I 0, v, GREENE I I i-34,125 FILTER ELEMENT I Fil fMarc h 1.925 4 Sheets-Sheet 2 J g/o INVENITOR. 06C 4r @reezze ATTORNEYS Nov.,5, 1929 o, v. GREENE 1,734,125

FILTER ELEMENT I Fi'led March 27, 1925 4 Sheets-Sheet 3 INVENTOR. Qsc a2? V r'eezze.

BY I E ATTORNEY).

Nov. 5, 192 9.- o. v. GR-EENE 1,734,125 I FILTER ELEMENT Filed March 27: 1925 4 Sheets-Sheet 4 fla 2d JNVENIOR.

06pm" rfazze A Tromvgms.

'equally efiicient manner throughout-its en- Patented Nov. 5, 1929 UNITED STATES PATENT OFFICE oscnn v. GREENE, or CLEVELAND, OHIO FILTER ELEMENT v Application, 'filed March 27, 1925. Serial No. 18,768.

stream to go through the center of the ele-' ment. As is well known, an air stream will tend to'pass through a filtering element at a greater velocity at the center than at the marginal portions of the element and thus the effectiveness of the filtering element will be less at the center than at the marginal portions and thepresent invention relates to the construction of an element in which the density of the filtering material is increased from the periphery or margin of the element to the center thereof so as tojcompensate for the tendency of theair stream to contract and to force the element to filter in a substantially tire surface area.-

The present element is also constructed so as to increase the density of the unit from the intake side to the exhaust side thereof to prevent the unit from fillingup or plugging or rapidly increasing-its resistance as the coarser material and some of the finer is filtered out before the denser layers are encountered. A unit compensated from the periphery to the center of the unit is not only adapted for filtering purposes but is also adapted for use as a compensator unit with fans or blowers or in any place where it is desired to control the flow of air and where the air stream tends to contract and increase velocity at the center. More particularly, the

present unit is constructed in the same general manner as the filtering element shown in my copending application for Unlted States Letters Patent, Serial No. 688 715, in which the filter element is built up of aseries of spaced parallel foraminous sheets which are separated by other foraniinous sheets which are corrugated or formed into a series of regular open folds. To the accomplishment of the foregoing and related ends, said in vention, then, consists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawings and the following a description set forth in detail certain mechamsm embodying the invention, such disclosed ,means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

' In said annexed drawings Fig. 1 is a plan view of the element taken from the air intake ,side thereof; Fig. 2 isa diagrammatic sectional view on the line 2-2 of Fig. 1; Fig. 3 is a sectional view on the line 33 of Fig. 2 showing in plan the element next to the exhaust side of the unit; Fig. 4 is a. diagrammatic sectional view on the line i4 of Fig. 3; Figs. 5. 6, 7,- 8, 9, 10,. 11 and 12 are diagrammatic sectional views taken on the lines 55, 6-6. 77, 8-8, 99, 1Q 10, 1111 and 12-12 respectively of Fig. 2 and showing in elevation the several sheets or units of the filtering element with the compensating sheet-s thereon as they occur throughout the unit; Fig. 13 is a developed plan view of the filtering'unit shown in Fig. 5; Fig. '14 is a plan View of .a modified type of filtering unit such as is shown in Fig. 3 with portions of each sheet broken away to show the several sheets and the crossing relation of the material; Fig. 15 is a sectional view on the line 15-15 of Fig. 14; Fig. 16 is a diagrammatic sectional view through a portion of the unit shown in Fig. 1 1 and showing the manner of securing the sheets in fixed position; Fig. 17 is a front.

plan view of the filtering'unit mounted in on the lines 18- 18 and 19-19 respectively of Fig. 17; and Fig. 20 is a diagrammaticplan view of the element showing the relative density of the unit.

The present constructionshows a filter unit' of the same general type as illustrated in my previously 'mentioned copending application its casing; Figs. 18 and 19 are sectional views '85 1 of the desired size through the unit.

up; of six of the spaced filtering sheets or units, each one being composed of one or I more of the sheets, their particular arrangement being described in detail hereinafter. Between each of these units is mounted one of the spacing units or corrugated sheets and there is preferably a corrugated sheet mounted on theintake side of the filtering element .over the last filtering unit.

The filtering unit 1 at the exhaustside of theelement is preferably made denser than any of the units ahead of it and as best shown in Figs. 3, 4 and 13, this unit cbnsists of three sheets 2, 3 and 1 of woven wire orscreen cloth so arranged as to have the wires of the cloth 4 of each sheet arranged at an angle to ,the

wires of the other sheet so as to form openings This unit is made by. taking a s eet of screen cloth of double the size of the finished unit which piece of cloth is'cut'on the bias as best shown that-the wires in the two halves of the double sheet run inditferentdirections.

For certain purposes, it may be desiredto add into this filtering unit at the exhaust side of the filtering element a sheet 5 of cloth fabric or the like and such a construction is shown in Figs. l i a'nd in which the unit be com posed of'the same double sheet 2 and 3 as shown in ormore of woven wire therebetween and also the sheet 5 of fine cloth material which is like- 7 wise inserted between the two halves of the double sheet. In front of this first filtering unit is mounted one of the corrugated sheets 10 and then the 'second filtering unit 6 is mounted and this unit isprcferably made of a pluralit of sheets 11, 12 and 13 as best shownin Fig. 5.: The doublesheet as illustrated iii-Figs. 5,'and 13 consists of two triangular portions 7 and 8 which may be the triangles left after cutting the bias sheet for the first unit and these triangular portions are first put together on the lineb b of Fig.

- 13 to forma rectangle double the size of the unit and are then folded along the center line aa with an inserted sheet 9 between to form the rectangular finish-ed unit in which the lines c-0 and ale-d on Fig. 5 indicate the edges of thetwo triangular pieces in their folded position.

In front of this unit 6 is mounted one of the corrugated sheets 10 such as is shown in 6 and then the third unit 15 will be mounted andthis unit will preferably consist of a single sheet15 of screen cloth formed by folding a triangle on itself so as to have the wires runhing-at an angle to the edges of the sheet and on-thiswill be mounted a smaller sheet 16 Fig. 15 with the inserted-sheet 4 which will have a smaller compensating sheet 21 mounted thereon, this sheet'being 'p'refen ably turned at 45 degrees to the main--sheet so as to have its corners centrally located at the sides of themain sheet as best shown in Fig. 9. Another corrugated'sheet 10 is thenmounted in the element and the next filtering.

unit consists of" a single'sheet 22-of screen cloth having a third and smaller compensating sheet 23 centrally mounted thereon with its wires running at an angle to the full size sheet as best shown in Fig. '10. 'Another cor-. 'rugated sheet lO'is'then used and the next filterin unit consists of a full size sheet 24 of scre ficlothwith a smaller compensatingsheet 25 mounted at the center. as shown in Fig. .11. The spacing corrugated sheetlO is then mounted and the last unit consists of merely a centrally located compensating sheet 26 smaller in area thenfthe compensating sheet 25 in the next layer and this compensating sheet is preferably formed of double or of woven wire cloth of two or three thicknesses and the'filtering element is thencomthe outer edge of the pleted by mounting another corrugated sheet 10 at the intake side of the unit and this corrugated sheet will be protected by a sheet 30 .of heavy: woven wire material which is .used

as the rapping device by which the filtering. element maybeicleaned.

i In making up the filtering units where the units are of'two or three or more thicknesses of the filtering material each of these units is preferably fastened together as best-shown in Fig; 16 by stapling as at 35 the various layers after they have been cut to size and folded or built up. Each of the filtering units is provided with either a selvage edge in the case of a unit consisting of a single sheet of material or of a folded edge 36 in the case of material and the folded and selvage edges of all ofv the 'units' are placed at the same side.

the units'having double or triple sheets of I rough wire ends which are apt to catch in the handso'f theusers and cause cuts or scratches and also to prevent .ravelling of the screens.

The casing 37: consists of a rectangular.

frame having inwardly extending flanges 40 on both sides and provided at the top witha handle 41 as shown in Figs. 17 and 18.- To

secure the filtering element in the casing, a

' and the filtering unit and theseholts are pref-'- to increase series of screws or bolts 42 are loyed' nous, sheets of varying size mounted adjacent which are passed through the casing anges certain of said first named sheets and adapted erably mounted in the'bottom' fianges-,.the unit a from the periphery to the center-thereof, said being deep enough to fit snugly'in-the-frame. last series of sheets varying from large to It is of course to be nnderstoodthat the small from the exhaust side to the inlet side number of filtering units mianelement, and of said unit.

the density of each unit willbe determined.

7 A filtering element comprising a series of i? bythe use to yhic h the element is to be put. spaced parallel sheets of Woven wire screen,

'ingof square or merely to illustrate one method of obtaining side thereof and a series of compensating sheets o'f-woyen wire material mounted ad-' jacentcertainof said first series of parallel The size, ,shape and arrangementi thecom other'sheets ofcorrugated woven Wire screenthe density ofthefcomplete umt pe'nsating screens will likewise vary withthe between saidfirst named sheets, said first se- 7 type of element employed, the present showries of screens being of greater density at the rectangular pieces being} exhaust side of said unit than at the intake a satisfactory structure.

By storming the exhaust side units of a phi rality of sheets having their wires runnlng in :sheets and reducing in size from exhaust to ditferent directions the density of-each of the or the equiv'alent'of such stated meansbe employed.

un'its'may' be varied to-wide limits to fit oper-.- ating conditions. V j eryto its center.

Other modes of applying the principle of my invention may be employed instead of the of spaced parallel woven wire screens, a con- I one explained; Chafige being m d as regards secutively corrugated wire screen interposed and a sheet or the mechanism herein disclosed, providedthe between said parallel screens, means stated by any of'the following claims cloth material mounted in flat contactual rev I v 9; A filtering element comprising a series of I therefore particularly point out anddis tinctly claim as niy invention 1 i p 1. A filtering element comprising a body tween. said parallel screens, and a sheet of of 'foraminous material arranged to form a cloth material mounted in flat contactual reseries of 'bafil'es, means incorporated in the la-tion w th the spacedparallel screens at the body of said material and adapted to increase exhaust side of'said filter.

v of battles and means cooperating therewith to the center thereofl 2. A filtering element comprising a series 1 the density of the element'fronntheperiphery Signed by me this 25th day of March, '1925.

OSCAR v. GR ENE.

adapted to increase the resistance ofsaid element to the passage'of'gas from the periphery also increasing in density I of spaced parallel to the center thereof. 4 I

3. A built tip-filtering element increasing in densityfrom the peripher to the center and om the air intake side to the air exhaust side. q 4. A filtering element comprising a series' foraminous sheets, and a series of compensating foraminous sheets of; v

'- varying size mounted-adjacent certain of nous sheets of varying size mounte said sheets and adapted to increase the dento the center thereof.

5. A filtering element comprising a, series of spaced parallel corrugated toraminous sheets, other foraminous sheets interposed in immediate sequence between said firstnamed sheets and a series of compensatin foramiadjacent certain of said sheets and adapted to increase the density of the complete .unit from the periphery to the center thereof. j r v 6. A filtering element comprising a seriesjot spaced parallel corrugated, foraminous sheets, other foraminous sheets interposed in Immediate sequence'between said first named sheets and a series of compensating foramlinlet side of said unit t0,f0rm a unit having a steadily increasingdensityfrom its periph- 1 8.-A filteringelement comprising a series lation with one of said spaced parallel screens. 

